There are
2,505 mi
from Rockville, MD to Pullman, WA
That's the driving distance. It would take 1 day 20 hours to go from Rockville, Maryland to Pullman, Washington.
The flight distance (direct flight from Rockville, MD to Pullman, WA) is 2,069.28 mi.
2,505 mi = 4,031.46 kms